Concentrator.



PATENTED APR. 26, 1904.

W. L; & F. S.GARD.

GONCENTRATOR.

APPLICATION FILED MAR. 2. 190a. N0 MODEL. 7 5 SHEETS-SHEET 1 m.75a,41$ x PATENTEZD APR. 26, 1904;

- w. L. & F. s. CARD. k

OONGENTRATOR.

APPLICATION FILED HA1, 2. 1903.

a sums-sum z.

H0 MODEL.

771% k z zfy No. 758,413. PATENTBD APR. 26, 1904.

W. L. 6: F. S. CARD.

GONGENTRATOR.

APPLIO ATION FILED HA3. 2. 1903. N0 IODBL. q 6 SHEETS-SHEET i.

Gnuenlons Momma No. 758,413. PATENTED APR. 26, 1904. W. L. 6: F. S. CARD. CONOENTRATOR.

APPLICATION FILED EAR. 2;. 1903. N0 MODEL. 5 SHEETB8HBET 5.

7m: uonms PETERS co. vnoruuma. WASMINGTQN. nv c.

UNITED STATES Patented April 26, 1904.

PATENT OFFICE,

WILLIAM L. CARD AND FRANK S. CARD, OF DENVER, COLORADO.

CONCENTRATOR.

ELECIFICATION forming part of Letters Patent No. 758,413, dated April 26, 1904.

Application filed March 2, 1903.v v

To all whom it may concern.-

Be it known that we, WILLIAM L. CARD and FRANK SCARD, citizens of the United States,

residing in the city and county of Denver,

view looking from the feed side of the table,

the feederhaving been removed. Fig. 4c is an inverted plan view of the table, showing the reaction devices or spring for moving the table, the slide-bearings, and means for lubricating the bearings. Fig. 5 is an enlarged transverse sectional view of the table and its subframe for the track-rods. Fig. 6 is an enlarged plan view of a portion of the tailings' side of the table, near the toe thereof, showing the arrangement of the baflie-buttons. Fig. 7 is a perspective view showing various forms of baffle-buttons which may be employed. Fig. 8 is a perspective View of a strip which may be used in forming the concentratingsurface of the table. Fig. 9 is a crosssection of the strip shown in Fig. 8, taken on the line 00 m. Fig. 10 is an enlarged detached view of one of the slide-bearings of the table, showing the manner of lubricating the bearing; Fig. 11, an enlarged detail view of a portion of the subframe, the adjustable track-rod, and the anchor-link for maintaining the relation of the adjustable track-rod with the subframe. Fig. 12 is an enlarged detached view of one of the shoes of the adjustable track-rod. Fig. 13 is an enlarged perspective view of that one of the tilting-wedges to which the poweris applied in adjusting the table. Fig. 14: is an enlarged perspective View of one of the wedgebrackets of the subframe.

is an enlarged view of the cranks, pitmen, and vibrator of the mechanism which actuates the table. Fig. 16 is a perspective new of a Fig. 2is a side view Fig. 15, Sheet 1,

Serial No. 145,717. (No model.)

.face and concentrating-channels, illustrating the merging of the channels with the surface of the table at a greater or less distance from the front end of the table.

Like symbols refer to like parts wherever they occur.

Our invention relates generally to that class of reciprocating concentrator-tables whose concentrating-surfaces are composed of a series of longitudinallydisposed channels and interposed plane surfaces, which tables are inclined transversely to their line of reciprocation and with which a supply of dressingwater is employed to elfect the separation of the values from the gangue by the operation of gravity and the flow of the water.

the efficiency of a concentrator of this class is determined by the saving of values, cleanlif. ness of products, and capacity, and these rethe table,1as well as to relieve the table of a greater part of the load of dressing-water at that point, and to accomplish this we cause the concentrating-channels to deepen and widen from the heel of the table toward the toe of the table, preferably for a distance equal to if not greater than the extent of the feed of the pulp thereon, and such a construction embodies one feature of'our' invention.

. A second object of our invention is to cause the gradual approach of the concentrates or values to the plane of the table in their movement toward the toe of the table, so that the.

Fig. 18 is an enlargedv As is well understood by those skilled in the art,

, of mineral, &e., which come over the forward channels are kept filled and present a plane surface for the separation of the gangue by the action of the dressing-water; and to accomplish this we cause the concentrating-ch annels to shallow and narrow from a point corresponding substantially with the zone of pulp-feed toward the toe or front end of the table, and such a construction embodies another feature of our invention.

A further object we have in view is to increase the capacity of the table by reducing the amount of middlings or admixture of coarser particles of gangue, lighter particles end of the table at the lower corner thereof, and this we accomplish by deflecting or breaking up the flow of dressing-water by a series of baffle-buttons arranged between the channels at the lower forward end of the table and preferably on diagonal lines corresponding with the zone of the middlings, whereby the lighter minerals will be deposited in the channels and'the coarser gangue deflected toward the tailings side of the table, and such a construction embodies a further feature of our invention.

There are other features of invention involving the relative depth, length, and arrangement of the channels of the concentrating-surface and the construction and arrangement of the mechanism for adjusting the lateral inclination of the table, all as will be hereinafter more fully pointed out, and finally summed up in the claims.

\Ve will now proceed to describe our invention more fully, so that others skilled in the art to which it appert-ains may apply the same.

For the support of the concentrator-table and its adjuncts a suitable subframe is provided, which may consist of longitudinal timbers 1 1, resting on mudsills, if desired, and braced by cross-timbers or distance-blocks 2, (see Fig. 5,) the whole bolted together above and below by a series of cross-rods 3 3.

Bolted or otherwise secured on top of one ofthe longitudinal timbers 1 of the subframe are a series of brackets 4, (see Fig. 5,) having perforated bosses or eyes for the passage and support of a track-rod 5, which may be rigidly secured to the brackets t by set-screws 6 or in other suitable manner. To the opposite longitudinal timber 1 of the subframe, and preferably to the side thereof, are secured a second set of brackets 7, having track-plates 8 for the support and travel of a series of lifting-wedges 9, the number of such liftingwedges corresponding with the number of brackets 7 and the several wedges being coupled to move in unison by means of a rod 10, which passes through passages in the wedges 9 and to which they are rigidly connected by set-screws 11. One of said liftingwedges 9 is provided upon its outer side at the base with an integral rack 12, with which a toothed segment or a pinion l3, journaled on one of the brackets 7, (preferably the end bracket,) engages, said pinion being provided with a hand-lever 14, by means of which the pinion may be rotated to impart an endwise movement or travel to the series of lifting- Wedges 9 9.

Resting upon the upper inclined faces of the wedges 9 9 are a series of correspondingly-inclined plates or shoes 15, the latter provided with perforated shanks or posts 16 1.6, through which passes a second track-rod 17, the trackrod 17 and shoes 15 being rigidly connected by set-screws 18.

In order to permit the vertical rise of the track-rod 17 and at the same time anchor it against endwise movement, an anchor-link or pitinan 19, pivoted at one end on a bracket 20, secured to the subframe, and at the other to a collar21, adjustable on the track-rod, is provided, and said collar 21 is fixed after adjustment by means of a set-screw 22 or in other suitable manner.

The two track-rods 5 and 17, the former fixed and the latter vertically adjustable, constitute the means for imparting to the concentrator-table any desired lateral inclination.

Supported by and traveling longitudinally on said track-rods is the concentrator-table (J, the framing of which may consist of the stringers 23 23 (see Figs. 4: and 5) and cross-timbers 24 24, adequately bolted or otherwise connected for the proper support of the concentrating-surface, which may be formed of a series of strips 25 25 or in other suitable manner. When the table-surface is made up of separate strips 25, said strips (see Fig. 8) are provided on the opposite edges with tapering bevels from a to a and from b to b on one side and from a to a and b to Z) on the other side, the length of the taper from a to a and from a to a being less than that from I) to b and from b to 6', while the transverse inclination of the bevel will also be less on one side of the strip than upon the other, (see Fig. 9,) so that when the strips are laid to form the concentrating-surface of the table (see Figs. 1 and 5) the crosssections of the concentrating-channels will have a gradual inclination transversely from the feed side of the table and an abrupt inclination toward the tailings side of the table, said inclines meeting at an obtuse angle, (see Fig. 5,) while the channels which are rectilinear Will widen and deepen longitudinally from the heel of the table (see Fig. 1) for a third, more or less, of their lengths or for substantially the extent of the pulp-feed, as from c to c. Said channels may be uniform in depth and width for a short distance, as from o to (Z, and finally narrow and shallow progressively for the remainder of their lengths toward the toe orfront of the table, as from (Z to (Z. The concentrating-surface of the table, however, may be otherwise constructed than from previously-prepared strips; but however constructed its characteristic features will consist in ITO concentrating-channels whose cross-sections approximately correspond with the operative cross-sections of a prospectors gold-pan and which shallow and narrow from an intermediate point toward both ends of the table. On reference to Figs. 5 and 18, which show a cross-section of the table, it will be noted that the concentrating-channels, taken in respect to the flow of the dressing-water transversely of the table, are comprised of a gentle downward incline from the feed side of the table and an abrupt or steep incline or rise toward the tailings side of the table, the two inclines forming an obtuse angle, the bottom of the channel being deepest contiguous to the tailings discharge side of the table, and the same is to be taken as intended by us wherever in this specification we refer to the channels as having the cross-section corresponding with the operative cross-section of the prospectors gold-pan. If desired, thechannels adjacent to the upper or feed side of the table may be made shallower than those adjacent tothe tailings discharge side, and the intermediate channels may progressively in-v a series of adjustable bafile-buttons 31, the 4 effect of which by reason of the reciprocating movement of the table is to obstruct the material coming forward on the intervening planes deflecting the water and all material in suspension or partial suspension therein across the channels without material interference with their mineral contents, whereby the major portion of the gangue constituents of the middlings is discharged over the tailings discharge side of the table, while the major portion of the mineral constituents follows the channels passing through between the buttons and over the toe of the table. These baffle-buttons may be of wood secured to the table between the channels by screws and may be of any desired form, several of which have been shown in Fig. 7 of the drawings. At suitable intervals on the under side of the stringers 23 23 of the table are secured slide-bearings 32, by means of which the concentratortable rests and travels upon the track-rods '5 and 17. These. slidebearings are provided with oil-chambers 33 (see Fig. 10) and ports leading to the hearing, as well as with supplypipes 34, leading to the oil-chambers 33, and in order to allow for cleaning of the ports coarser pulp, the latter delivery-pipe being also controled by'a valve k. The spitz-kasten, which is suitably supported independently of the concentrator-table, delivers the pulp into a feeder 36, located on the upper or feed side of the table, at the rear or heel thereof, which feeder is carried by and moves with the table. The feeder 36 is provided with a series of feed outlets or apertures, (shown in dotted lines,

spitz-kasten Fig. 2,) which are controlled by adjustable gates 36, (see Fig. 1,) and the length of the feeder is preferably approximately.one-third (t) the length of the table or substantially the length of such portions of the concentratingchannels as widen. from the heel or rear end of the table toward the front end or toe of the table.

Arranged along the feed side and carried by thetable is the dressing-water pipe 37, which may have a branch extending transversely of the table at its forward end, as at 38, and said main and branch pipes are provided with valves 37 and 38, whereby the volume and force of the dressing-water delivered to the table may be regulated. The pipes 37 and 38 are perforated at intervals for the distribution of the dressing-water uniformly, and the main pipe 37 is connected with the water-supply by a flexible pipe connection or hose 39 of such length and arrangement as will permit of "the reciprocation of the table without distort ing or displacing the said hose 39.

M indicates a trough for the reception of middlings from the table, and N a rotary pump for returning the middlings to the feeder 36 through a suitable pipe, as indicated in dotted lines at the right in Fig. 2, The pump N may be driven by means of a belt from a pulley a on the main shaft of the mechanism, by means of which the concentrator-table is reciprocated.

Upon a suitable bed-plate 40, supported by the longitudinal timbers 1 l of the subframe, is erected the mechanism or movement, which imparts the reciprocating impulse to the concentrator-table. This movement comprises two cranks 41 and 42, a vibrator 43, and the interposed pitmen 44 and 45 45. Of the two cranks 41 and 42 the first is a revolving crank and the second an oscillating crank, and the two cranks are preferably so relatively positioned that the chord drawn through the ends of the quadrant described by the oscillating crank 42 will intersect the'axis of the shaft 41 of the revolving crank 41. The

length of the pitman 44, which connects the revolving crank 41 with the oscillating crank 42, will determine the character of the movement imparted to the table, and accordingly by lengthening or shortening said pitman 44,

which can be done either by means of an adjustable pitman or by substituting pitmen of different lengths, the character of the movement of the table may be regulated at will.

The vibrator 43, which is pivoted at 43 on the bed-plate in front of the oscillating crank 42, is connected to said crank and operated therefrom through the medium of the intermediate pitmen 45 45. It is this vibrator which imparts the throw or impulse to the table, and in order to regulate the extent of movement or lineal displacement of the table the vibrator is provided with a slide 46, which is adjustable on the vibrator toward and from the pivot 43, and said adjustable slide 46 may be fixed in any desired position by the setscrews 46. The slide 46 of the vibrator 43 engages a buffer-block 47, which is secured to the rear end of the concentrator-table, and the face of said buffer 47 is extended vertically to provide for the vertical adjustment of vibrator-slide 46, according as the stroke of the table is to be lengthened or shortened.

P P indicate fast and loose pulleys on the shaft 41 of the revolving crank 41, by means of which the said crank 41 is revolved.

The forward impulse of the table being imparted by any suitable movement or mechanism, the reverse or return travel is accomplished by means of a tension-spring 48, one end of which is secured to the stringers 23 23 on the under side of the table by a springbail 49, its opposite end being attached to the bed-plate 40 of the movement by means of an anchor-rod 50 or in other suitable manner. In order to provide for adjusting the tension of the reaction-spring 48, the end of anchorrod 50 where it passes through the bed-plate 40 (see Fig. 1) may be threaded and provided with a nut 50.

In Figs. 16 and 17 of the drawings a modified form of table-surface has been shown with which may be used concentrator-channels having the characteristics hereinbefore pointed outviz., channels which narrow and shallow progressively from an intermediate point on the table toward the ends thereof. In constructing this form of table-surface the stringers instead of having their top and bottom edges parallel are progressively tapered from one end to the other, as at 23*, and the stringers are then arranged with their tapers sloping in reverse directions, as indicated in Fig. 17, after which when the cross-timbers are applied and the strips which form the concentrating-surface of the table are secured in position the concentrator-table will be level transversely in the center thereof, the tailingsdischarge side will be higher at the rear end than the feed side at the same end and the reverse at the forward end of the table, thus giving the table-surface such a form that there will be the least tendency for the material under treatment to move toward the tailingsdischarge side at the rear end, where the pulp is fed to the table; but this tendency will increase in degree from the rear all the way to the forward end, where it will be a maximum.

The construction of the concentrator-table and its adjuncts being substantially such as hereinbefore pointed out, the same will operate as follows: The pitman 44 of the movement being of suitable length to give the desired character to the reciprocation of the table, the slide 46 of the vibrator 43 having been adjusted to give the desired length of travel to the table, the wedges 9 having been adjusted to raise the track-rod 17 and give the desired lateral inclination to the table, the water-pressure in the spitz-kasten having been adjusted by means of the valve w and the volume of the dressing-water adjusted by means of valves 37 and 38, and,

finally, the gates 36 adjusted to graduate the. feed of pulp to the table, all of which will be determined by the character of the material to be operated upon, the mechanism for reciprocating the table will be set in motion, and the pulp fed from the launder into the spit-z-kasten, from whence it passes into the feeder and out upon the table at its upper or feed side adjacent to the rear end or feed of the table. The pulp being thus delivered to and across that portion of the table where the concentrating-channels are initially narrow and shallow and progressively widen and deepen as they extend forward, the loosening up or separation of the contents of the channels as the material advances into the portions of greater cross-section will facilitate the gravitation of the finer values to the bottoms of the channels, whence they are assisted forward in their travel toward the toe of the table by the movement of the coarser particles without liability of being washed out of the channels and at the same time this reduction of the area of the channels at the rear end or heel of the table relieves the latter of a large part of the load of dressing-water, which would be of no service upon the table at this point. As the contents of the concentrating-channels advance they reach the gradually narrowing and shallowing portions of said channels, which formation of the channels tends to keep them constantly filled by the material under treatment, and the surface of the table so far as the action of the dressing-water is concerned is that of a plane surface, while the gentle inclination of the upper walls of the channels insures that the mineral deposited on the intervening plane surface shall follow said incline to the bottoms of the channels or to the apex of the obtuse angles formed by the walls of the channels. In the middlings zone of the table the dressing- II I i. I l

water carrying in partial suspension the coarser particles of gangue will come in contact with the baffle-buttons, which will deflect the flow of the dressing-water, and, owing to' the reciprocation of the table, will cause whirls or eddies of insufficient force to affect the mineral matter in the channels, whence it passes between the buttons to and over the front of the table, while the lighter gangue is deflected by the said baffle-buttons and is carried over the tailings side of the table with the dressing-water.

In the event that the ore to be treated is of a character which contains an insuflicient amount of mineral to fill the channels when the same are extended to the front end of the table the channels may be made to merge with the surface of the table at a greater or less distance from the front end thereof, so as to leave a plane surface in front of the ends of the channels for the final dressing of the values and the elimination of any gangue which may have been carried forward with the mineral in the channels. As illustrating such'a construction, see Fig. 19 of the drawings. All the channels of the table may terminate or merge with the surface of the table C at a transverse line .2 2, as does the channel 9, all the channels may terminate ormerge with the surface of the table C at transverse line 3/ y, as does the channel it, all the channels may merge with the table C at its front end, as does the channel 2', which latter is the construction shown in Figs. 1 and 16 of the drawings, and, finally, all the channels may be formed, so as to merge with the plane of the table-surface at an imaginary transverse line :10 w in advance of the front end of the table C. The lines w m, y y, and .2 2 on the diagram Fig. 19 are not to be taken as arbitrary lines, as they will vary accordingly as the ore is richer or leaner, the leaner ores demanding shorter channels and more plane surface at the front end of the table than do the richer ores.

Having thus described our invention, what we claim, and desire to secure byLetters Patcut, is

1. A concentrator-table having concentrating-channels which widen from the rear end of the table toward the front end thereof, and means for actuating the table, said table being adapted to retain sufiicient pulp thereon to permit stratification, substantially as and for the purposes specified."

2. A concentrator-tablehaving concentrating-channels which both widen and deepen from the rear end of the table toward the front end thereof, and means for actuating the table, said table being adapted to retain sufficient pulp thereon to permit stratification, substantially as and for the purposes specified.

3. A concentrator-table having concentrating-channels which Widen progressively from the rear or feed end of the table toward the front end thereof, which channels have a transverse. section formed by the meeting at an obtuse angle of a gentle and an abrupt incline, said table being adapted to retain sufflcient pulp thereon to permit stratification, and means for actuating the table, substantially as and for the purposes specified. I

4. Aconcentrator-table having concentrating-channels which widen and deepen pro-' gressively from the rearor feed end of the table toward the forward end thereof, which channels have atransverse section formed by the meeting at an obtuse angle of a gentle and an abrupt i cline, said table being adapted to retain sufii ient pulp thereon to permit stratification, and means for actuating the table, substantially as and for. the purposes speci-- fied. h

5. A concentrator-table having concentrating-channels which narrow from an intermediate point in the length of the table toward both ends thereof, and means for actuating the table, substantially as and for the purposes specified.

6. A concentrator-table having concentrating-channels which narrow and shallow from an intermediate point in the length of the table toward both ends thereof, and means for actuating the table, substantially as and for the purposes specified.

7 A concentrator-table, having concentrating-channels which narrow from an intermediate point in the length of the table toward both ends thereof, the cross-section of said channels being'formed by a gentle incline and an abrupt incline which meet at an obtuse angle, and means for actuating the table, substantially as and for the purposes specified.

8. A concentrator-table, having concentrating-channels which narrow and shallow from an intermediate point in the length of the table toward both ends thereof, the cross-section of said channels being formed by a gentle incline and an abrupt incline which meet at an obtuse angle, and means for actuating the table, substantially as and for the purposes specified.

' 9. A concentrator-table having concentrata toward both ends thereof, said channels separated by intervening plane surfaces, and

means for actuating the table, substantially as and for the purposes specified.

' l1. Aconcentrator-table having concentrating-channels which narrow from an intermediate point in the length of the table toward both ends thereof, which channels have atransverse section formed by the meeting at an-ob-' tuse angle of a gentle incline and an abrupt incline, said channels separated by intervening plane surfaces, and means for actuating the table, substantially as and for the purposes specified.

12. The combination with a concentratortable, of baffle-buttons arranged in the middlings zone of the table, and means for actuatingthe table, substantially as and for the purposes specified.

13. The combination with a concentratortable having longitudinally-disposed channels and intervening plane surfaces, of baffle-buttons arranged on the table between the channels, and means for actuating the table, sub stantially as and for the purposes specified.

14:. The combination with a concentratortable and its subframe, of a fixed track-rod, an adjustable track-rod, an anchor-link for the adjustable track-rod, inclined shoes for the adjustable track-rod, and wedges for elevating the adjustable track-rod, substantially as and for the purposes specified.

15. The combination with a concentratortable and its subframe, of a fixed track-rod, an adjustable track-rod, an anchor-link for the adjustable track-rod, wedges for elevating the adjustable track-rod, a coupling-rod for connecting said wedges, and rack-and-pinion mechanism for actuating the wedges, substantially as and for the purposes specified.

16. A concentrator-table having concentrating-channels which deepen from the heel or feed end of the table toward the toe or discharge end, said channels adapted to discharge at one end, and said table adapted to retain sufficient pulp thereon to permit stratification, and means for imparting a long tudinal concentrate-discharging vibration to the table, substantially as and for the purposes specified.

17. A concentrator-table having longitudinally-disposed concentrating-channels which are deeper at a point intermediate their lengths than at their ends, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

18. A concentrator-table having longitudinally-disposed concentrating-channels which deepen from their rear ends toward their front ends, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

19. A concentrator-table having longitudinally-disposed concentrating-channels which shallow from an intermediate point in the length of the table toward both ends thereof, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

20. A concentrator-table having longitudinally-disposed concentrating-channels which progressively shallow from a point intermediate their ends toward both ends thereof, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

21. A concentrator-table having longitudi= nally-disposed concentrating-channels which widen from their rear ends toward their front ends, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

22. A concentrator-table having longitudinally-disposed concentrating-channels which both widen and deepen from their rear ends toward their front ends, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

23. A concentrator-table having longitudinally-disposed concentrating-channels which narrow from a point intermediate their ends toward both ends thereof, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

24. A concentrator-table having longitudinally-disposed concentrating-channels which narrow and shallow from a point intermediate their ends toward both ends thereof, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

25. A concentrator-table having longitudinally disposed concentrating-channels which narrow and shallow from a point intermediate their ends toward both ends thereof, said channels having a cross-section formed by a gentle incline and an abrupt incline which meet at an obtuse angle, and means for actuating the table, substantially as and for the purposes specified.

26. A concentrator-table having longitudinally-disposed concentrating-channels which both widen and deepen from their rear ends toward their front ends, said channels having a cross-section formed by a gentle incline and an abrupt incline which meet at an obtuse angle, and means for actuating the table, substantially as and for the purposes specified.

27. A concentrator-table having rectilinear channels which Widen from the rear end of the table toward the front end thereof, said channels adapted to discharge concentrates at one end. and means for actuating the table, substantially as and for the purposes specified.

28. A concentrating-table having rectilinear channels which both widen and deepen from the rear end of the table toward the front end thereof, said channels adapted to discharge concentrates at one end, and means for actuating the table, substantially as and for the purposes specified.

29. A concentrator-table having rectilinear channels which widen progressively from the rear end of the table toward the front end thereof, said channels adapted to discharge concentrates at one end, and having a transverse section formed by the meeting at an obtuse angle of a gentle and an abrupt incline, and means for actuating the table, substantially as and for the purposes specified.

i. A A l l I I t charge concentrates at one end, and means for actuating the table, substantially as and for the purposes specified.

31. A concentrator-table, having rectilinear concentrating-channels which narrow from an intermediate point in the length of the table toward both ends thereof, said channels adapted to discharge concentrates at one end, and means for actuating the table, substantially as and for the purposes specified.

32. A concentrator-table,having rectilinear concentrating channels which narrow and shallow from an intermediate point in the length of the table toward both ends thereof, said channels adapted to discharge concentrates at one end, and means for actuatingthe table, substantially as and for the purposes specified.

33. Aconcentrator-table, having rectilinear concentrating-channels, which narrow from an intermediate point in the length of the table toward both ends thereof, the cross-section of said channels being formed by a gentle and an abrupt incline which meet at an obtuse angle, said channels adapted to discharge concentrates at one end, and means for actuating the table, substantiallyv as and for the purposes specified.

34. A concentrator-table, having rectilinear concentrating channels which narrow and shallow from an intermediate point in the length of the table toward both ends thereof, the cross-section of's'aid channels formed by a gentle incline and an abrupt incline which meet at an obtuse angle, said channels adapted to discharge at one end, and means for actuating the table, substantially as and for the purposes specified.

. 35. Aconcentrator-table, having rectilinear concentrating-channels which narrow from an intermediate point in the length of the table toward both ends thereof, said channels adapted to discharge concentrates at one end, said channels being separated by intervening plane surfaces, and means for actuating the table, substantially as and for the purposes specifiec.

36. A concentrator-table, having rectilinear concentrating channels which narrow and shallow from an intermediate point in the length of the table toward both ends thereof, said channels adaptedto discharge concentrates at one end, said channels separated by intervening plane surfaces, and means for actuating said table, substantially as and for the purposes specified.

37. A concentrator-table, having rectilinear concentrating-channels which narrow from an intermediate point in the length of the table 1 toward both ends thereof, which channels have a transverse section formed by the meeting at an obtuse angle of a gentle incline and an abrupt incline, said channels adapted to discharge concentrates at one end, said channels being separated by intervening plane surfaces, and means for actuating the table, substantially as and for the purposes specified.

38. The combination with a concentratortable, of baffle-buttons arranged within the the longitudinal axis of the table, and means for imparting to the table a longitudinal vibration,-substantially as and for the purposes specified.

39. The combination with a concentratortable, of baffle-buttons arranged transversely thereof and at an angle to the longitudinal axis of the table, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

40. A concentrator-table having rectilinear concentrating channels which increase in depth from the rear end of the table toward the front end thereof, said channels adapted to discharge concentrates at one end, and means for actuating the table, substantially as and for the purposes specified.

41. Aconcentrator table, having longitudinally-disposed rectilinear concentrating-channels whichare deeper at a point intermediate their length than at their ends, said channels adapted to discharge concentrates at one end, andmeans for longitudinally vibrating said table, substantially as and for the purposes specified.

42. Aconcentrator-table, having longitudinally-disposed rectilinear concentrating-channels which deepen from their rear ends toward their front ends, said channels adapted to dis-- charge concentrates at one end, and means for imparting a longitudinal vibration to the ta- .ble, substantially as and for the purposes specified.

43. A concentrating-table, having longitudinally disposed rectilinear concentratingchannels which shallow from an intermediate point in the length of the table toward both ends thereof, said channels adapted to discharge concentrates at one end, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified. Y

44. A concentrator-table, having longitudi nally-disposed rectilinear concentrating-channels which progressively shallow from a point intermediate their ends toward both ends thereof, said channels adapted to discharge concentrates at one end, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

45. A concentrator-table having longitudinally-disposed rectilinear concentrating-channels which widen from their rear ends toward their front ends, said channels adapted to discharge concentrates at one end, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

4.6. A concentrator-table, having longitudinally-disposed rectilinear concentrating-channels which both widen and deepen from their rear ends toward their front ends, said channels adapted to discharge concentrates 'at one. end, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified. I

47. A concentrator-table, having longitudinally-disposed rectilinear concentrating-channels which narrow from a point intermediate of their ends toward both ends thereof, said channels adapted to discharge concentrates at one end, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

48. Aconcentrator-table, having longitudinally-disposed rectilinear concentrating-channels which narrow and shallow from a point intermediate their ends toward both ends thereof, said channels adapted ,to discharge concentrates at one end, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes speciliec 49. A concentrator-table, having longitudinally-disposed rectilinear concentrating-channels which narrow and shallow from a point intermediate their ends toward both ends thereof, said channels having a cross-section formed by the meeting of an obtuse angle of a gentle incline and an abrupt incline, said channels adapted to discharge concentrates at one end, and means for imparting a longitudinal vibration to the table, substantially as and for the purposes specified.

50. A concentrator-table, having longitudinally-disposed rectilinear concentrating-channels which both widen and deepen from their rear ends toward their front ends, said channels having a cross-section formed by the meeting at an obtuse angle of a gentle incline and an abrupt incline, said channels adapted to discharge concentrates at one end, and means for imparting a longitudinal vibration to the table, substantially as and for I VILLIAM L. CARD. FRANK S. CARD.

' l Vitnesses: I

FRANK C. GoLDsMI'rH, NORMAN W. Ram). 

